CN102759725A - Mongline digital range radar and communication method - Google Patents
Mongline digital range radar and communication method Download PDFInfo
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- CN102759725A CN102759725A CN2012102644485A CN201210264448A CN102759725A CN 102759725 A CN102759725 A CN 102759725A CN 2012102644485 A CN2012102644485 A CN 2012102644485A CN 201210264448 A CN201210264448 A CN 201210264448A CN 102759725 A CN102759725 A CN 102759725A
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Abstract
The invention provides a mongline digital range radar and a communication method, belongs to the technical field of automobile auxiliary parking, and solves the problem that a communication system of the existing digital range radar is complex in structure, high in cost and multiple in occupation connector. The communication method of the mongline digital range radar comprises sending information codes standing for measured range information, the information codes are a binary system, a first electrical level of first duration is connected with a second electrical level of the first duration to stand for 0, a first electrical level of second duration is connected with a second electrical level of the second duration to stand for 1, time duration of the first duration and the second duration is different, and electrical level values of the first electrical levels and the second electrical levels are different. The mongline digital range radar adopts the communication method. The mongline digital range radar and the communication method can be used for a digital ultrasonic range radar on an automobile.
Description
Technical field
The invention belongs to the auxiliary technical field of parking of automobile, be specifically related to a kind of single wire digital formula range radar and the means of communication thereof.
Background technology
Along with development of electronic technology, range radar in automobile is auxiliary in parking application more and more widely, it can record the distance between vehicle front and back end and barrier, thereby helps driver's operation of parking, and prevents accident.
Range radar is divided into analog and digital two kinds, because the gap of aspects such as anti-interference, sensitivity, the application of analog range radar is extensive far away from digital range radar.And from the means branch of measuring distance, range radar comprises ultrasonic ranging radar, range laser radar, infrared distance measurement radar etc., and wherein the application of ultrasonic ranging radar is the most extensive.
At present, digital range radar is multiple wire systems such as twin wire, four-wire type, and it mainly is made up of radar probe, control module.The radar probe is used for measuring distance information, and it can have a plurality of, and particular location, quantity determine according to vehicle; And control module can receive the range information from radar probe, and these information are sent to object elements such as display unit, alarm unit uses for the user.Wherein, before and after vehicle, a control module can be arranged respectively, and each control module can link to each other with a plurality of radar probes.
The inventor finds to have following problem in the prior art at least: the communication mode of existing control module is forms such as SCI, IIC, SPI; And these communication modes all are multiple-way system (double wire system, three-wire system, four-wire systems etc.); This causes in the system quantity of wire harness and connector many on the one hand, and complex structure, cost are high; On the other hand; Display unit is a human-computer interaction interface; Occupied interface quantity own is just more; The multi-thread communication need (if before and after the vehicle control module, each control module are arranged respectively all is two-wire system, and then display unit has been merely with the radar communication and just will be four-wire system at least) that can't adapt to range radar probably; Especially, if control module want to communicate with a plurality of object elements (like display unit and alarm unit) simultaneously, then its with each object element between all to be connected with the multiple-way system mode, more improved the complexity and the cost of system.
Summary of the invention
Technical matters to be solved by this invention comprises; High to the communication system complex structure of digital range radar of the prior art, cost, take the many problems of interface; A kind of means of communication of single wire digital formula range radar are provided; Its corresponding communication system is simple in structure, and cost is low, it is few to take interface, and communication working stability, antijamming capability are strong, highly sensitive, consistance and interchangeability is good, communications protocol is resolved simple.
Solving the technical scheme that technical matters of the present invention adopted is a kind of means of communication of single wire digital formula range radar, comprising:
Send the information code of the measured range information of representative; Said information code is a scale-of-two; Second level that wherein connects first duration with first level of first duration representes 0; Second level that connects second duration with first level of second duration representes 1, and this first duration is different with the time span of second duration, and first level is different with the level value of second level.
Wherein, " communication " carried out between radar and object element (like display unit, alarm unit etc.), is mainly used in the range information of passing on radar to record; " single line " is meant that the communication between digital range radar and the object element carries out through a data lines (being one wire system); It is enough poor that " first level is different with the level value of second level " are meant that between the two level value has; Thereby can be discerned by communication system, for example can be that first level is a high level, and second level is a low level; Perhaps also can be that first level is a low level, second level be a high level.
Come the value of representative data (to represent 1 and low level represents 0 with different level in the multiple-way system means of communication like high level; Otherwise certainly also can); So must use independent clock sync signal to unify the clock of each unit in this type communication means; It is said that determining when that one digit number is totally lost complete (in other words confirm how signal is divided), so it will have an additional clock at least, can't realize single-wire communication.In the means of communication of single wire digital formula range radar of the present invention; Bits per inch is according to being represented by two varying levels that join; And, confirm one digit number so available specific level changes (when promptly sporting first level by second level) and be totally lost complete (division signals in other words), so it need not be provided with clock line through the value that the difference of signal time length is come representative data; Can realize single-wire communication; Thereby simplified structure, the number of ports that reduces cost and take, and can guarantee that communication working stability, antijamming capability are strong, highly sensitive, consistance and interchangeability is good, communications protocol is resolved simple.Especially want simultaneously and a plurality of object elements (like display unit and alarm unit) when communicating when control module; According to method of the present invention; As long as its data line is linked to each other with a plurality of unit simultaneously; Each unit all can independently be resolved the signal that obtains, and many clock lines needn't be set.
Preferably; After the information code of the measured range information of said transmission representative; Also comprise: send the check code that becomes radix-minus-one complement with said information code; Second level that wherein connects first duration with first level of first duration representes 0, and second level that connects second duration with first level of second duration representes 1.
Preferably, before the information code of the measured range information of said transmission representative, also comprise: send synchronizing signal, said synchronizing signal is second level of the 3rd duration.
Further preferably, said the 3rd duration is between 995 μ s to 1005 μ s.
Preferably, before said transmission synchronizing signal, also comprise: send waiting signal, said waiting signal is first level of the 4th duration.
Further preferably, said the 4th duration is between 100ms to 150ms.
Preferably, also comprise: when said single wire digital formula range radar breaks down, send fault-signal.
Preferably, said information code is 8.
Preferably, said first duration is between 495 μ s to 505 μ s, and said second duration is between 195 μ s to 205 μ s; Or said second duration is between 495 μ s to 505 μ s, and said first duration is between 195 μ s to 205 μ s.
Technical matters to be solved by this invention also comprises; High to the communication system complex structure of digital range radar of the prior art, cost, take the many problems of interface; A kind of single wire digital formula range radar is provided; It is simple in structure, and cost is low, it is few to take interface, and communication working stability, antijamming capability are strong, highly sensitive, consistance and interchangeability is good, communications protocol is resolved simple.
Solving the technical scheme that technical matters of the present invention adopted is a kind of single wire digital formula range radar, comprising:
The radar probe that is used for measuring distance;
Control module is used to receive the range information that said radar probe records, and with the above-mentioned means of communication said range information is sent to object element, and said control module is connected with object element through a data lines.
Wherein, control module can be forms such as single-chip microcomputer, and it preferably can become one with the radar probe, i.e. the corresponding control module of radar probe.
Because single wire digital formula range radar of the present invention can adopt the above-mentioned means of communication, so it is simple in structure, cost is low, it is few to take interface, and communication working stability, antijamming capability are strong, highly sensitive, consistance and interchangeability is good, communications protocol is resolved simply.
The present invention is specially adapted in the digital type ultrasound wave range radar on the automobile.
Description of drawings
Fig. 1 is the schematic flow sheet of the means of communication of the single wire digital formula range radar of embodiments of the invention 2;
The waveform synoptic diagram that sends in the means of communication of Fig. 2 for the single wire digital formula range radar of embodiments of the invention 2.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, the present invention is described in further detail below in conjunction with accompanying drawing and embodiment.
Embodiment 1:
Present embodiment provides a kind of means of communication of single wire digital formula range radar, comprising:
Send the information code of the measured range information of representative; Said information code is a scale-of-two; Second level that wherein connects first duration with first level of first duration representes 0; Second level that connects second duration with first level of second duration representes 1, and this first duration is different with the time span of second duration, and first level is different with the level value of second level.
Come the value of representative data (to represent 1 and low level represents 0 with different level in the multiple-way system means of communication like high level; Otherwise certainly also can); So must use independent clock sync signal to unify the clock of each unit in this type communication means; It is said that determining when that one digit number is totally lost complete (in other words confirm how signal is divided), so it will have an additional clock at least, can't realize single-wire communication.In the means of communication of the single wire digital formula range radar of present embodiment; Bits per inch is according to being represented by two varying levels that join; And, confirm one digit number so available specific level changes (when promptly sporting first level by second level) and be totally lost complete (division signals in other words), so it need not be provided with clock line through the value that the difference of signal time length is come representative data; Can realize single-wire communication; Thereby simplified structure, the number of ports that reduces cost and take, and can guarantee that communication working stability, antijamming capability are strong, highly sensitive, consistance and interchangeability is good, communications protocol is resolved simple.Especially want simultaneously and a plurality of object elements (like display unit and alarm unit) when communicating when control module; Method according to present embodiment; As long as its data line is linked to each other with a plurality of unit simultaneously; Each unit all can independently be resolved the signal that obtains, and many clock lines needn't be set.
Embodiment 2:
Present embodiment provides a kind of means of communication of single wire digital formula range radar; Wherein single wire digital formula range radar be vehicle-mounted, be used for auxiliary digital type ultrasound wave range radar of parking, its mode and display unit on the vehicle through one wire system, alarm unit etc. carry out communication.Certainly, the digital range radar of other types also can adopt the means of communication of present embodiment.
Like Fig. 1, shown in Figure 2, the means of communication of the single wire digital formula range radar of present embodiment comprise:
S01, preparation are parked, and radar powers on.
S02, radar begin to send ultrasound wave and find range; Preferably, radar sends the waiting signal of high level (i.e. first level) simultaneously to vehicle-mounted display unit (being object element).This wait signal is the signal that in the stand-by period of transmitting between the range information for twice, sends, its (about 2ms ~ 15ms), and should be definite according to the net synchronization capability and the display performance of display unit that should find range the used time greater than radar.
Preferably, waiting signal continues 100ms ~ 150ms (i.e. the 4th duration).The signal length of this duration is enough, can satisfy the requirement of any display unit basically, and is simultaneously not long again, can not cause substantial influence to the range finding effect.
S03, preferred, radar sends the synchronizing signal of low level (i.e. second level) to display unit.Synchronizing signal notice display unit is waited for and being finished, and prepares beginning transmission range information.
Preferably, synchronizing signal continues 995 μ s to 1005 μ s (i.e. the 3rd duration).The duration gap of this duration and waiting signal and follow-up sign indicating number is all enough big, be not easy to cause decoding error, and it is not long again, can not hinder the transmission of range information.
S04, send binary information code, information code is represented the measured distance of radar.Preferably, information code is 8 (D0 ~ D7), because it can represent 256 data like this, if be unit with 2cm, distance that then can maximum expression 5.1m can satisfy the needs of parking completely.
Wherein, The coding rule of this binary information code is: connect low level (the i.e. second level) expression 0 of first duration with the high level (i.e. first level) of first duration; The low level that connects second duration with the high level of second duration representes 1, and this first duration is different with the time span of second duration.That is to say, be not to distinguish 0,1 in the present embodiment, but distinguish 0,1 through the difference of signal time length through the difference of level.
Preferably, first duration is (being that 0 complete signal continues about 1ms) between 495 μ s to 505 μ s, and second duration is (being that 1 complete signal continues about 0.4ms) between 195 μ s to 205 μ s; Certainly because 0,1 definition is relative in the coding, otherwise therefore also can, promptly second duration is between 495 μ s to 505 μ s, first duration is between 195 μ s to 205 μ s.
Obviously, the resolution of any communication system all is limited, so the signal duration can not be lacked very much (otherwise being difficult to identification); And there is certain error certainly in the transmission of signal, so the difference between first duration and second duration can not too little (otherwise identification error can take place); Simultaneously, the weak point that first duration and second duration should be tried one's best again is to reduce the required time of transmission.And the preferable range of the first above duration and second duration just in time can satisfy aforesaid three requirements simultaneously.
Be height through the level value of coming judgment data in the common multiple-way system means of communication,, clock line must be set independently unify the clock of each unit, be necessary for " multiple-way system " thereby cause it it is said that therefore when one digit number is totally lost in order to distinguish.And in the method for present embodiment; No matter what the value of data is, form by half the low level according to all being connect by half the high level for bits per inch, and promptly its waveform is the same; Just time span is different; Therefore after object element (display unit) receives signal, be exactly that one digit number is totally lost complete (also will distinguish the influence of waiting signal, synchronizing signal etc. certainly) by low level when the transformation of high level, independently judge its value through the duration of this bit data again it is said that can assert each generation; Thereby it needn't use clock line, can realize single-wire communication.Simultaneously, the means of communication of present embodiment have also that strong, the clever lightness of working stability, antijamming capability is high, consistance and interchangeability is good, signal resolution is simple fast, needn't change hardware and can be through advantages such as software realizations.
In addition; Another advantage of the means of communication of present embodiment is; Because its signal that sends can independently be decoded by object element; Do not need clock line, so radar only needs a data lines can be simultaneously to send signal (simultaneously be connected in this data line on get final product a plurality of object elements) to a plurality of object elements (like display unit, alarm unit).
S05, preferred, (V0 ~ V7), the coded system of check code is identical with the coded system of information code to send the check code that becomes radix-minus-one complement with information code; Obviously, check code also should be 2 systems, preferably also should be 8.
Check code is the radix-minus-one complement of information code, so it can play the effect of authorization information sign indicating number, thereby improves the reliability of data.For example, if radar does not detect barrier, the information code of its transmission converts 16 systems into, and (display unit changes 16 systems into so that handle after receiving information code; And information code remains with 2 system forms when transmitting) after should be 0x00 (wherein " 0x " expression data be 16 systems; " 00 " is actual data), and if display unit is received check code and change them into 16 systems after find that data are 0xff, think that then data are correct; If then decision data mistake, range finding again of other data.
Through check code is set, can strengthens anti-interference, and make waveform relatively be easy to observation, thereby the reliability of communication is significantly improved.
Preferably, the means of communication of present embodiment also comprise: when radar breaks down, send fault-signal.Wherein, This fault-signal can above-mentioned information code and the form of check code send, for example, when radar breaks down; Can make the value of information code and check code be 1 (or other do not meet the particular value of radix-minus-one complement rule); For example, be 0xffff if display unit receives behind information code and the check code what change it into 16 systems obtain, can judge that then radar breaks down.Through fault-signal is set, can make radar have the fault prompt facility, further improve its reliability.
Whether S06, judgement range finding finish, if then radar is closed; Then return step S02 if not, continue to send waiting signal, beginning is range finding and communication next time.
Wherein, First level in the present embodiment is a high level; Second level is that low level mode is a concrete example, and it fully also can adopt second level is high level, and first level is low level mode (is among the embodiment whole high-low levels just in time conversely).
Embodiment 3:
Present embodiment provides a kind of single wire digital formula range radar, comprising:
The radar probe that is used for measuring distance;
Control module is used to receive the range information that said radar probe records, and with the above-mentioned means of communication said range information is sent to object element, and said control module is connected with object element through a data lines.
Wherein, control module can be forms such as single-chip microcomputer, and it preferably can become one with the radar probe, i.e. the corresponding control module of radar probe.
Because the single wire digital formula range radar of present embodiment can adopt the above-mentioned means of communication; So it is simple in structure; Cost is low, it is few to take interface, and communication working stability, antijamming capability are strong, highly sensitive, consistance and interchangeability is good, communications protocol is resolved simple.
It is understandable that above embodiment only is the illustrative embodiments that adopts for principle of the present invention is described, yet the present invention is not limited thereto.For the one of ordinary skilled in the art, under the situation that does not break away from spirit of the present invention and essence, can make various modification and improvement, these modification also are regarded as protection scope of the present invention with improving.
Claims (10)
1. the means of communication of a single wire digital formula range radar is characterized in that, comprising:
Send the information code of the measured range information of representative; Said information code is a scale-of-two; Second level that wherein connects first duration with first level of first duration representes 0; Second level that connects second duration with first level of second duration representes 1, and this first duration is different with the time span of second duration, and first level is different with the level value of second level.
2. the means of communication of single wire digital formula range radar according to claim 1 is characterized in that, after the information code of the measured range information of said transmission representative, also comprise:
Send the check code that becomes radix-minus-one complement with said information code, second level that wherein connects first duration with first level of first duration representes 0, and second level that connects second duration with first level of second duration representes 1.
3. the means of communication of single wire digital formula range radar according to claim 1 is characterized in that, before the information code of the measured range information of said transmission representative, also comprise:
Send synchronizing signal, said synchronizing signal is second level of the 3rd duration.
4. the means of communication of single wire digital formula range radar according to claim 3 is characterized in that,
Said the 3rd duration is between 995 μ s to 1005 μ s.
5. the means of communication of single wire digital formula range radar according to claim 1 is characterized in that, before said transmission synchronizing signal, also comprise:
Send waiting signal, said waiting signal is first level of the 4th duration.
6. the means of communication of single wire digital formula range radar according to claim 5 is characterized in that,
Said the 4th duration is between 100ms to 150ms.
7. the means of communication of single wire digital formula range radar according to claim 1 is characterized in that, also comprise:
When said single wire digital formula range radar breaks down, send fault-signal.
8. according to the means of communication of any described single wire digital formula range radar in the claim 1 to 7, it is characterized in that,
Said information code is 8.
9. according to the means of communication of any described single wire digital formula range radar in the claim 1 to 7, it is characterized in that,
Said first duration is between 495 μ s to 505 μ s, and said second duration is between 195 μ s to 205 μ s;
Or
Said second duration is between 495 μ s to 505 μ s, and said first duration is between 195 μ s to 205 μ s.
10. a single wire digital formula range radar is characterized in that, comprising:
The radar probe that is used for measuring distance;
Control module; Be used to receive the range information that said radar probe records; And with any described means of communication in the claim 1 to 9 said range information is sent to object element, and said control module is connected with object element through a data lines.
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| CN107888339A (en) * | 2017-11-27 | 2018-04-06 | 卫星电子（中山）有限公司 | A kind of carrier wave sending method for being easy to reduce the binary code of transmission power |
| WO2018107528A1 (en) * | 2016-12-16 | 2018-06-21 | 北京万集科技股份有限公司 | Laser radar system and distance measurement method |
| CN109901115A (en) * | 2019-04-04 | 2019-06-18 | 加特兰微电子科技(上海)有限公司 | The transmitting device and radar system of radar data |
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| CN109901115A (en) * | 2019-04-04 | 2019-06-18 | 加特兰微电子科技(上海)有限公司 | The transmitting device and radar system of radar data |
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